Kinetic and structural requirements for a CO2 adsorbent in sorption enhanced catalytic reforming of methane – Part I: Reaction kinetics and sorbent capacity

Halabi, Marwan; Croon, M.H.J.M. de; Schaaf, J. van der; Cobden, P.D.; Schouten, J.C.

doi:10.1016/j.fuel.2012.04.016

Cited by 27 publications

(17 citation statements)

References 36 publications

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“…The conversion vastly improved with temperature, which is typical of the endothermic reforming process. 20,54,55 HM1, HM2, and HM3 displayed 96.1, 90, and 56% conversion at T = 773 K. The presence of ceria in HM1 possibly improved material stability, thereby resulting in high conversion. Owing to its capability of storing oxygen, ceria lowers carbon deposition on the catalyst.…”

Section: Resultsmentioning

confidence: 99%

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Improved Hydrogen Production from Sorption-Enhanced Steam Reforming of Ethanol (SESRE) Using Multifunctional Materials of Cobalt Catalyst and Mg-, Ce-, and Zr-Modified CaO Sorbents

Ghungrud

Vaidya

2019

Ind. Eng. Chem. Res.

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Hydrogen (H 2 ) was produced via sorption-enhanced steam reforming of ethanol (SESRE) over multifunctional hybrid materials made of cobalt (10 wt %) and a Ca-based sorbent modified by CeO 2 , ZrO 2 , and MgO. SESRE provides an excellent opportunity for producing pure H 2 from renewable ethanol by merging catalytic steam reforming and removal of the co-product carbon dioxide (CO 2 ) in a single process. The chosen hybrid materials were synthesized using the coprecipitation method and denoted as Co−CaO/CeO 2 (or HM1), Co−CaO/ZrO 2 (or HM2), and Co−CaO/MgO (or HM3). Their features were investigated using electron microscopy, X-ray diffraction, and CO 2 -temperature-programmed desorption. Their sorption capacity and adsorption breakthrough time were determined. All of the chosen materials performed remarkably well and improved H 2 production. Especially, hybrid materials containing cerium (HM1) and zirconium (HM2) displayed better adsorption capacity and extended breakthrough time than those bearing magnesium (HM3). At T = 773 K, HM1 showed the longest breakthrough time (45 min) and adsorption capacity (5.61 mol CO 2 /kg sorbent). Material HM2 demonstrated its highest breakthrough time (30 min) and adsorption capacity (3.78 mol CO 2 /kg sorbent) at T = 723 K and produced >85 mol % H 2 . HM3 displayed the highest breakthrough time (15 min) and adsorption capacity (1.51 mol CO 2 /kg sorbent) at T = 773 K, producing >75 mol % H 2 . The effects of reaction temperature, steam-tocarbon ratio in the feed, and gas hourly space velocity on the SESRE process were investigated. The performance of HM1, HM2, and HM3 was assessed over 20 cycles, and it was found that they were stable for up to 13, 10, and 5 cycles. Finally, probable reaction pathways for SESRE were discussed.

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Section: Resultsmentioning

confidence: 99%

“…Such materials are promising because mass transfer resistance is low and the adsorbent sites can be easily accessed. In many recent works, they were successfully used for producing pure H 2 . − …”

Section: Introductionmentioning

confidence: 99%

Improved Hydrogen Production from Sorption-Enhanced Steam Reforming of Ethanol (SESRE) Using Multifunctional Materials of Cobalt Catalyst and Mg-, Ce-, and Zr-Modified CaO Sorbents

Ghungrud

Vaidya

2019

Ind. Eng. Chem. Res.

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“…The sorption-enhanced reactions are normally conducted between 573 and 773 K. In this temperature range, physisorbents for CO 2 such as zeolites and activated carbons have relatively low capacities or are not tolerant to competing species such as water. On the other hand, chemisorbents such as supported amines, calcium oxide, and lithium zirconates are either unstable, exhibit slow adsorption kinetics, or are difficult to regenerate. − Consequently, research efforts are currently being devoted to developing suitable adsorbents for sorption-enhanced hydrogen production. − …”

Section: Introductionmentioning

confidence: 99%

Layered Double Oxides Supported on Graphene Oxide for CO₂ Adsorption: Effect of Support and Residual Sodium

Iruretagoyena

Shaffer

Chadwick

2015

Ind. Eng. Chem. Res.

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The use of graphene oxide (GO) as support has been shown previously to improve the CO2 adsorption performance of layered double oxides (LDOs). In this contribution, the separate promoting effect of GO has been distinguished clearly from the influence of alkali species remaining from the layered double hydroxide coprecipitation. A range of sodium-free LDO and LDO/GO hybrids with relatively low GO loadings have been prepared and characterized. These have been compared to adsorbents with sodium residues deliberately left by minimum washing of the precipitates. The incorporation of GO was found to enhance considerably the thermal stability of the LDO and to reduce the loss of site heterogeneity during temperature swing cycling. The impact of the gradual loss of surface heterogeneity of the materials on the CO2 adsorption equilibrium is shown to be described by the Toth model. CO2-TPDs did not reveal any significant modification in the nature of the sites relevant for adsorption at 573 K induced by the presence of GO in the range of loadings studied. Sodium ions incorporated by leaving residual sodium from the synthesis greatly enhanced the adsorption capacity of the unsupported and supported LDOs. The improved thermal stability achieved by use of GO in the LDO/GO hybrids was not affected significantly by the presence of residual sodium. Compared to other LDO supports, GO hybrids were found generally to exhibit higher adsorption capacities per total volume of adsorbent after multiple adsorption–desorption cycles.

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“…In recent years, a new concept involving simultaneous hydrogen production and in situ CO 2 removal by adsorption has been proposed. This process is well known as the sorption‐enhanced reaction process and has been widely studied for steam methane reforming . An analysis of these studies shows that sorption‐enhanced steam reforming process for H 2 production has the following potential advantages over the conventional reforming process: (1) high‐purity hydrogen production in a single step, (2) simplification of the hydrogen production process, (3) no supplemental energy for the primary reactor and reduction of the heat exchangers, (4) reduction of primary reactor operating temperature, which may reduce energy usage and catalyst sintering, (5) less expensive reactor materials, and (6) the reduction of the capital cost of the processing steps required for subsequently CO 2 separation are removed …”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Sorption‐Enhanced Steam Glycerol Reforming: Sorption Kinetics and Reactor Simulation

2012

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in Wiley Online Library (wileyonlinelibrary.com).Sorption-enhanced glycerol reforming, an integrated process involving glycerol catalytic steam reforming and in situ CO 2 removal, offers a promising alternative for single-stage hydrogen production with high purity, reducing the abundant glycerol by-product streams. This work investigates this process in a fixed-bed reactor, via a two-scale, nonisothermal, unsteady-state model, highlighting the effect of key operating parameters on the process performance. CO 2 adsorption kinetics was investigated experimentally and described by a mathematical reaction-rate model. The integrated process presents an opportunity to improve the economics of green hydrogen production via an enhanced thermal efficiency process, the exothermic CO 2 adsorption providing the heat to endothermic steam glycerol reforming, while reducing the capital cost by removing the processing steps required for subsequently CO 2 separation. The operational time of producing high-purity hydrogen can be enhanced by increasing the adsorbent/catalyst volume ratio, by adding steam to the reaction system and by increasing the inlet reactor temperature.

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Kinetic and structural requirements for a CO2 adsorbent in sorption enhanced catalytic reforming of methane – Part I: Reaction kinetics and sorbent capacity

Cited by 27 publications

References 36 publications

Improved Hydrogen Production from Sorption-Enhanced Steam Reforming of Ethanol (SESRE) Using Multifunctional Materials of Cobalt Catalyst and Mg-, Ce-, and Zr-Modified CaO Sorbents

Improved Hydrogen Production from Sorption-Enhanced Steam Reforming of Ethanol (SESRE) Using Multifunctional Materials of Cobalt Catalyst and Mg-, Ce-, and Zr-Modified CaO Sorbents

Layered Double Oxides Supported on Graphene Oxide for CO₂ Adsorption: Effect of Support and Residual Sodium

Hydrogen Production by Sorption‐Enhanced Steam Glycerol Reforming: Sorption Kinetics and Reactor Simulation

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Kinetic and structural requirements for a CO2 adsorbent in sorption enhanced catalytic reforming of methane – Part I: Reaction kinetics and sorbent capacity

Cited by 27 publications

References 36 publications

Improved Hydrogen Production from Sorption-Enhanced Steam Reforming of Ethanol (SESRE) Using Multifunctional Materials of Cobalt Catalyst and Mg-, Ce-, and Zr-Modified CaO Sorbents

Improved Hydrogen Production from Sorption-Enhanced Steam Reforming of Ethanol (SESRE) Using Multifunctional Materials of Cobalt Catalyst and Mg-, Ce-, and Zr-Modified CaO Sorbents

Layered Double Oxides Supported on Graphene Oxide for CO2 Adsorption: Effect of Support and Residual Sodium

Hydrogen Production by Sorption‐Enhanced Steam Glycerol Reforming: Sorption Kinetics and Reactor Simulation

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Layered Double Oxides Supported on Graphene Oxide for CO₂ Adsorption: Effect of Support and Residual Sodium